Relief-valve for storage batteries.



PATENTED MAY 16, 1905.

D. P. PERRY. I RELIEF VALVE EUR STORAGE BATTERIES.

APPLIOATION FILED MAY 22, 1903.

w l n UNITED STATES Patented May 16, 1905.

PATENT OFFICE.

DAVID P. PERRY, OF CHICAGO, ILLINOIS, ASSIGNOR TO VESTA STORAGE BATTERY COMPANY, A CORPORATION OF MAINE.

RELIEF-VALVE FOR STORAGE BATTERIES.v

SPECIFICATION forming part of Letters Patent No. 789,87*?, dated May 16, 1905.

Application filed May 22, 1903. Serial No. 158,238.

To @ZZ whom, it i12/ty concern:

Be it known that I, DAVID P. PERRY, a citi- Zen of the United States of America, and a resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in Relief-Valves for Storage Batteries, of which the following' is a specilication.

My invention contemplates asimple and ct'- iicient valve device which can be applied to any ot' the many 'forms or constructions of secondary or storage batteries and which is ol a character to notonly permit ready access to the interior of the battery, but which is also adapted to permit the generated gases to escape freely and without danger ot' spilling the electrolyte and without danger of dust or dirt entering the battery.

The nature and advantages of my invention will, however, hereinafter more fully appear.

In the accompanying drawings, Figure 1 is a plan of a storage battery equipped with a relief-valve constructed in accordance with my invention. Eig'. 2 is a vertical section ot' the same. Eig. 3 is an enlarged sectional view of my improved relief-valve.

The storage battery A can be of any suitableknown or approved I'orm. As illustrated it comprises a suitable body or receptacle adapted to contain a suitable electrolyte and also adapted to inelose the plates or elements B. Preferably my improved relief-valve C is applied to the top of the battery and is in the I'orm of a cap c. This cap is provided with a central opening c/ and also with an internally-threaded lower portion c. lYithin this threaded lower portion I place a rubber diaphragm c3, which is provided with a minute central opening' or pin-prick c" and which preferably has its marginal portions clamped tightly between the under face or surface oi' the cap and the top or upper surface of the threaded boss d, which latter can be a rigid portion of the battery cell or body. lNith this arrangement the cap constituting part et' the valve device can be readily removed, so as to permit access to the interior of the battery. Furthermore, the rubber diaphragm with its small opening will yield readily to the inter nal pressure of any gases which may be generated within the battery, and the stretching or outward bulging' of the rubber will cause the opening' c" to open suiliciently to permit such gases to escape. Thus the gases can escape constantly and Yfreely and without danger of having' the electrolyte spill or slop over. 55 In other words, I providean elastic or extensible relief-opening which is normally closed or practically closed, but which is capable 0I' stretching' or expanding to an extent to permit the ready escape of the gases. At the 6o same time the rubber diaphragm eii'ectually seals the battery against the admission of d ust, dirt, or other `foreign substances to its interior and also against the undesirable spilling' or slopping over ot' the electrolyte, and, as 65 stated, the valve can be removed for the purpose ot' affording' access to the interior ot' the battery or for the purpose oi' replacing an old or impaired diaphragm with a new one.

A mass ol suitable material D, such as par- 7o aiIin or rubber wax, can be packed in around the necks or bosses t otl the cells, so as to seal the same and prevent the acid from affecting the connections E.

IVhat I claim as my invention is I. A storage battery, comprising a number 0I' cells or compartments, each having a hollow neck or boss, connections for said cells, a rubber diaphragm on each neck or boss, an aperturcd cap screwed down on each dia- 8O phrag'm, and wax like material packed in around the said necks or bosses and the said connections.

2. A battery-cell having its top provided with a hollow neck or boss affording' access to 85 the interior ot' the battery, said neck or boss being externally threaded at its upper end, and a disk of thin rubber resting on the upper end of said neck or boss, said disk being' elastic and provided with a minute opening adapted to open when the disk is stretched by internal pressure, and a cap provided with an internally-threaded portion adapted to screw upon the externally-threaded portion of the said neck or boss, said cap being adapted to clamp the marginal portions of the said rubber disk upon the upper end of said neck or jeeted to said internal pressure due to the genboss, and the said cap having' its top provided eration of gas in the battery. I0 with an aperture of sufficient size to expose Signed by me at Chicago, Illinois, this 12th more or less of the rubber disk immediately day of May, 1903.

surrounding the said minute opening therein, DAVID l). PERRY. whereby the Central portion of said disk may Witnesses:

stretch and bulge outwardly for the purpose CHAs. C. BULKLEY,

or' openingI said minute opening when sub- WM. A. HARDENs. 

